No there is not unfortunately. I’ve looked into this in the past making my own variant of C. The User Defined Languages work completely differently from the ones already built in. There are ways of adding new keywords to existing languages though if this is all you are wanting to do. If you use the menu Settings > Style Configurator... and select VB under the languages languages and WORDS under the style list, towards the right you can add user-defined keywords. This may not be exactly what you were wanting but it may be enough to get by if you don’t want to recreate VB as a user defined language.